Before you buy a new cell phone or new tablet, please try the following procedure to repair your device. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.!
LG Optimus 4X HD P880 hard resetUsing the hard reset
If your phone does not restore to the original condition, use a Hard Reset (Factory Reset) to initialise it.
Turn the power off.
Press and hold the Power/Lock key + Volume Down key.
Once LG Logo appears on the screen, release all Keys. After some seconds, allow you to
select factory reset wipe data function in the Android system recovery utility.
Scroll the list by Volume keys and select it by Power/Lock key.
If you perform a Hard Reset, all user applications, user data and DRM licenses will be deleted.
Please remember to back up any important data before performing a Hard Reset.
To reset your LG Optimus 4X HD P880 hard reset phone to factory settings and erase all the data on your phone, Select Settings → Back up and reset→ Factory data reset → Reset device→ Delete all.
Android ICS 4.0 and Jelly Bean 4.1 or higher
Resetting the phone does not erase any system software updates you have downloaded or any files on your microSD card,
such as music or photos. If you reset the phone in this way, you are prompted to re-enter the same information that you did when you first started Android.
You can use LG Mobile Support tool to repair your LG cell phone, after download select menu Customer Support > Recovery Phone
When you cannot recall your LG P880 unlock pattern:
If you logged in to your Google account on the phone but failed to enter the correct
pattern 5 times, tap the Forgot pattern button. You are then required to log in with your Google account to unlock your phone.
If you have not created a Google account on the phone or you forgot it, you have to perform a hard reset.